In Create, one can stretch belts for 20m—without any power loss—for the cost of 6 dried kelp and a crafting table.

In this mod, wires can only stretch 10m—with a 25% power loss at the alternator—for the cost of 2 copper ingots and a rolling machine. This makes wires seem extremely expensive compared to belts, when, in real life, it's the other way around. One would expect wires to be able to be stretched at least that long, and quite probably farther. I would suggest giving copper wires a range of 30m (1.5x) and gold wires 40m (2.0x).

25% loss is at any distance, the wires themselves have no loss, Think of the 25% as "mechanical friction", the wire length is configurable